SPY, ES, and NQ - Low Volume but Big Jump?

One thing that I pay attention to is the trading volume. You see, with such a moderate trading volume, SPY rose 1.5%. I think it's REALLY strange. Usually, with low volume, SPY ends up flat(which I mean, roughly +/-.5%). But this is really the "Special" one - low volume but BIG jump. I personally perceive that as a trap, as I am seeing NQ and ES are all having significantly lower trading volume but with significant shoots up. Let's see how it goes, but I am opening shorts.